Can also kite from the caravan park on cootharaba, further round than boreen point. Similar conditions, possibly more space tho. Big lake so not overly gusty on SE, I've had some great sessions there while camping.
Lake weyba, launch best with a buddy wading out a bit with you & launching over water (easily done, it's shallow miles out). Also gusty.
Sunny coast river mouths - can be good but some hazards - swimmers/boats/fishers/kiters and also outgoing tide will claim your board if you let it.
Drive round bribie till you hit the perfect angle, clean wind but slightly protected water. Takes some practice and confidence, alone & deep & currents.
I have kited beachmere a few times (staying close to sunny coast) it's ok on low/mid tide, lots of flat sand. Stay north as far as poss (north end of the dead end beach road) so you don't catch deception bay germs